Colds, due to universal carriers, 240 path of entrance of, 244 vaccines in, 241 Colonies, characteristics of plate, 223-226 definition of, 173 Color production, 112 Colorimetric method of standardization, 175 Combustion, spontaneous, 116 Commensal, 87 Commercial preparation of lactic acid, 99 products, why keep, 131 vaccines, 285 Communicable disease, 232 Complement, 273 deviation test, 277 effect of temperature on, 274 fixation test, 276-279 lecithin as, 274 relation to toxins and enzymes, 273 source of, 277 Complementoid, 274 Complementophil haptophore, 273 Complements, nature of, 274 Composition, chemical, 81-85 related to fungi, 39 relation to food, 81 Concentration of antitoxin, 264 Condenser, 200 Conditions for growth, general, 72 maximum, 72 minimum, 72 optimum, 72 spore formation, 51 Congenital immunity, 251, 252 Conjunctiva as path of entrance, 244 Constant temperature apparatus, 213 Contact beds, 116 Contagion, direct and indirect, 34 Contagious abortion, agglutination test, 268 complement-fixation text, 277 path of elimination, 248 of entrance, 245 Contagium, definition of, 232 vivum theory, 25, 28, 33 Contamination of food by carriers, 241 Continuous pasteurization, 141 Contrast stains, 205 Convalescents, control of, 239-240 CORNALIA, 29 Corpuscles, Babes-Ernst, 45 red, in complement-fixation test, 278, 279 malaria, etc., in, 249 Corrosive sublimate as disinfectant, 158 _Corynebacterium diphtheriæ_, 64, 69, 128, 233, 234, 261, 263 Coryza, acute, 244 Cotton plugs, 21, 184 Coughing, 248 Crateriform liquefaction, 221 Cream ripening, 97 CREITE, 271 _Crenothrix_, 61 Creolin as disinfectant, 160 Cresols as disinfectants, 159 Culture, definition of, 171 medium, definition of, 171 essentials of, 172 inoculation of, 186, 192 kinds of, 172 liquid, 172, 173 methods of using, 184 optimum moisture for, 73 plating of, 188 reaction of, 81, 216 selective, 198, 199 solid, 172, 173 standardization of, 174, 175 synthetic, 183 titration of, 174 use of, 173 tubes, description of, 184 Cultures, anaërobic, 188-192 from internal organs, 229 mass, 188 plate, 188 potato, 186 puncture, 185 pure, definition of, 171 isolation of, 194-199 slant, 186 slope, 186 stab, 185 Curled edge, 225 Cutaneous inoculation, 228 Cycle, carbon, 107 nitrogen, 107 phosphorus, 107 sulphur, 108 Cystitis, 234 Cytolysin, 272 Cytolysins, 271-279 Cytolytic, 272 power of blood, 272 serums, failure of, 275 substances in immunity, 295 Cytophil group, 273 Cytoplasm, 41 Cytotoxic, 272 D DALLERA, 289 Dark field illumination, 204 DAVAINE, 28, 35